Publications
2018

B. Fu, T.J. Freeborn, "Biceps tissue bioimpedance changes from isotonic exerciseinduced fatigue at different intensities," Biomed. Phys. Eng. Express., vol. 4, no. 2, 025037, 2018.
T.J. Freeborn, T. Crenshaw, S. Critcher, "Hook artifact correction of localized electrical bioimpedance for improved agreement between different device measurements," Biomed. Phys. Eng. Express, vol. 4, no. 1, 015016, 2018. D. Kubanek, T.J. Freeborn, "(1+α) fractionalorder transfer functions to approximate lowpass magnitude responses with arbitrary quality factor," Int. J. Electron. Commun. (AEU), vol. 83, pp. 570578, 2018. M.R. Esco, H.N. Williford, A.A. Flatt, T.J. Freeborn, F.Y. Nakamura, "Ultrashortened timedomain HRV parameters at rest and following exercise in athletes: An alternative to frequency computation of sympathovagal balance," Eur. J. Appl. Phys., vol. 118, no. 1, pp. 175184, 2018. 
2017

A.A. AlAli, A.S. Elwakil, B.J. Maundy, T.J. Freeborn, "Extraction of phase information from magnitudeonly bioimpedance measurements using a modified KramersKronig transform," Circuits Syst. Signal Process., 2017.
A. Allagui, A.S. Elwakil, T.J. Freeborn, "Supercapacitor reciprocity and response to linear current and voltage ramps," Electrochim. Acta, vol. 258, pp. 10811085, 2017. A.S. Elwakil, A. Allagui, T.J. Freeborn, B.J. Maundy, "Further experimental evidence of the fractionalorder energy equation in supercapacitors," Int. J. Electron. Commun. (AEU)., vol. 78, pp. 209212, 2017. C. Vastarouchas, G. Tsirimokou, T.J. Freeborn, C. Psychalinos, "Emulation of a electricalanalogue of a fractionalorder human respiratory mechanical impedance model using OTA topologies," Int. J. Electron. Commune. (AEU), vol. 78, pp. 201208, 2017. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Variability of Colemodel bioimpedance parameters using magnitudeonly measurements of apples from a twoelectrode configuration," Int. J. Food Properties, vol. 20, no. S1, pp. S507S519, 2017. B.S. Nickerson, M.R. Esco, B.M. Kliszczewicz, T.J. Freeborn, "Comparison of bioimpedance and underwater weighing body fat percentage before and acutely after exercise at varying intensities," J. Strength Cond. Res., vol. 31, no. 5, pp. 13951402, 2017. A. Elwakil, A. Radwan, T.J. Freeborn, A. Allagui, B. Maundy, M. Fouda, "Lowvoltage commercial supercapacitor response to periodic linearwithtime current excitation: a case study," IET Circuits Devices Syst., vol. 11, no. 3, pp. 189195, 2017. 
2016

A. Allagui, T.J. Freeborn, A.S. Elwakil. B. Maundy, "Reevaluation of performance of electric doublelayer capacitors from constant current charge/discharge and cyclic voltammetry," Sci. Rep., 6, 38568, 2016.
A. Lemmon, T.J. Freeborn, A. Shahabi, "Fixturing impacts on high frequency lowresistance, lowinductance impedance measurements," Electron Lett., vol. 52, no. 21, pp. 17721774, 2016. T.J. Freeborn, "Estimating supercapacitor performance for embedded applications using fractionalorder models" Electron. Lett., vol. 52, no. 17, pp. 14781480, 2016. [Corrigendum] A. Allagui, A.S. Elwakil, B. Maundy, T.J. Freeborn, "Spectral capacitance of series and parallel combinations of supercapacitors," ChemElectroChem, vol. 9. no. 3, pp. 14291436, 2016. G. Tsirimokou, C. Psychalinos, T.J. Freeborn, A.S.Elwakil "Emulation of current excited fractionalorder capacitors and inductors using OTA topologies" Microelectron. J., vol. 5, pp. 7081, 2016. T.J. Freeborn, "Comparison of (1+α) fractionalorder transfer functions to approximate lowpass Butterworth magnitude responses," Circuits Syst. Signal Process., vol. 35, no. 6, pp. 19832002, 2016. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Approximated fractionalorder inverse Chebyshev filters," Circuits Syst. Signal Process., vol. 35, no. 6, pp. 19731982, 2016. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Compact wide frequency range fractionalorder models of human body impedance against contact currents," Math. Prob. Eng., vol. 2016, Article ID 4967937, 2016. 
2015

T.J. Freeborn, B. Maundy, A.S. Elwakil, "Fractionalorder models of supercapacitors, batteries, and fuel cells: a survey," Mater. Renew. Sustain. Energy, vol. 4, no. 3, 2015.
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Approximated fractional order Chebyshev lowpass filters," Math. Prob. Eng., vol. 2015, Article ID 832468, 2015. 
2014 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Extracting the parameters of the doubledispersion Cole bioimpedance model from magnitude response measurements," Med. Biol. Eng. Compute., vol. 52, no. 9, pp. 749758, 2014.

2013 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Cole impedance extractions from stepresponse of a current excited fruit sample," Compute. Electron. Agric., vol. 98, pp. 100108, 2013.
T.J. Freeborn, "A survey of fractionalorder circuit models for biology and biomedicine," IEEE J. Emerging Sel. Top. Circuits Syst., vol. 3, no. 3, pp. 416424, 2013. T.J. Freeborn, B. Maundy, A.S. Elwakil, "Measurement of supercapacitor fractionalorder model parameters from voltage excited step response," IEEE J. Emerging Sel. Top. Circuits Syst., vol. 3, no. 3, pp. 367376, 2013. T.J. Freeborn, B. Maundy, "Incorporating FPAAs into laboratory exercises for analogue filter design," Int. J. Electr. Eng. Educ., vol. 50, no. 2, pp. 188200, 2013. T.J.Freeborn, B. Maundy, A.S. Elwakil, "Fractional resonancebased RLβCα filters," Math. Prob. Eng., vol. 2013, Article ID 726721, 2013. 
2012 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Least squares estimation technique of ColeCole parameters from step response," Electron. Lett., vol. 48, no. 13, pp. 752754, 2012.
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Fractional TowThomas biquad filters," Nonlinear Theor. Appl., IEICE, vol. 3, no. 3. pp. 357374, 2012. 
2011 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Numerical extraction of the ColeCole impedance parameters from step response," Nonlinear Theor. Appl., IEICE, vol. 2, no. 4. pp. 548561, 2011.
B. Maundy, A.S. Elwakil, T.J. Freeborn, "On the practical realization of higherorder filters with fractional stepping," Signal Process., vol. 91, no. 3, pp. 484491, 2011. 
2010 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Field programmable analogue array implementation of fractional step filters," IET Circuits Devices Syst., vol. 4, no. 6, pp. 514524, 2010.

Conferences
2018

S.L. Burkett, S. Gerster, T.J. Freeborn, E.R. Giannini, R.M. Frazier, D.M. McCallum, G. Quenneville, "Renewable Resources: Theme with Broad Societal Impact for REU Students," ASEE Annual Conf. & Expo, Salt Lake City, U.S.A., 2018
T.J Freeborn, A.S. Elwakil, A. Allagui, "Supercapacitor fractionalorder model discharging from polynomial timevarying currents," IEEE Int. Symp. Circuits Syst., Florence, Italy, 2018. T.J Freeborn, G.W. Bohannan, "Changes of fractionalorder model parameters in biceps tissue from fatiguing exercise," IEEE Int. Symp. Circuits Syst., Florence, Italy, 2018. 
2017

T.J Freeborn, A. Allagui, A.S. Elwakil, "Modelling supercapacitors leakage behaviour using a fractionalorder model", Euro. Conf. Circuit Theor. Design, Catania, Italy, 2017.
C. Vastarouchas, G. Tsirimokou, T.J. Freeborn, C. Psychalinos, A.S. Elwakil, "Design of a wood tissue impedance emulator in monolithic form," Euro. Conf. Circuit Theor. Design, Catania, Italy 2017. T.J. Freeborn, A.S. Elwakil, "Variability of supercapacitor fractionalorder parameters extracted from discharging behavior using least squares optimization," IEEE Int. Symp. Circuits Syst., pp. 15101513, Baltimore, U.S.A,, 2017. S. Critcher, T.J. Freeborn, "Variability of electrical impedance measurements collected from human forearm using multiple electrode configuration," Southern Biomed. Eng. Conf., pp. 172175, Gulfport, U.S.A., 2017. T. Crenshaw, T.J. Freeborn, "Effects of muscle fatigue on electrical impedance of bicep muscles during exercises of varying intensity: a case study," Southern Biomed. Eng. Conf., pg. 183187, Gulfport, U.S.A., 2017. R.J. Mathews, T.J. Freeborn, "Effect of muscle engagement and measurement position on electrical impedance of thigh muscles," Southern Biomed. Eng. Conf., pg. 168171, Gulfport, U.S.A., 2017. 
2016

T.J. Freeborn, A.S. Elwakil, C. Psychalinos, "Analysis of a rectifier circuit realized with a fractionalorder capacitor," IEEE Int. Conf. Microelectron., pp. 3336, Cairo, Egypt, 2016.
B.J. Maundy, A.S. Elwakil, T.J. Freeborn, A. Allagui, "Improved method to determine supercapacitor metrics from highpass filter response," IEEE Int. Conf. Microelectron., pp. 2528, Cairo, Egypt, 2016. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Electrode location impact on Coleimpedance parameters using magnitudeonly measurements," IEEE Midwest Symp. Circuits Syst., pg. 2124, Abu Dhabi, United Arab Emirates, 2016. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Factors impacting accurate Coleimpedance extractions from magnitudeonly measurements," IEEE Conf. Systems Man Cybernetics, pp. 223227, Budapest, Hungary, 2016. B. Maundy, A.S. Elwakil, T.J. Freeborn, A. Allagui, "Determination of supercapacitor metrics using a magnitudeonly method," IEEE Int. Symp Circuits Syst., pp. 11861189, Montreal, Canada, 2016. 
2013

T.J. Freeborn, B. Maundy, A.S. Elwakil, "Simplifying Coleimpedance extractions from the currentexcited step response," IEEE Midwest Symp. Circuits Syst., pp. 952955, Columbus, U.S.A, 2013.
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Accurate time domain extraction of supercapacitor fractionalorder model parameters," IEEE Int. Symp. Circuits Syst., pp. 22592262, Beijing, China, 2013. 
2012 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Improved ColeCole parameter extraction from frequency response using least squares fitting," IEEE Int. Symp. Circuits Syst., pp. 337340, Seoul, South Korea, 2012.

2010 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Second order approximation of the fractional Laplacian operator for equalripple response," IEEE Midwest Symp. Circuits Syst., pp. 11731176, Seattle, U.S.A, 2010.
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Towards the realization of fractional step filters," IEEE Int. Symp. Circuits Syst., pp. 10371040, Paris, France, 2010. 
Book Chapters
2013

T.J. Freeborn, B. Maundy, A.S. Elwakil, "FractionalStep Analog Filter Design" in Analog/RF and Mixed Signal Circuit Systemic Design, pp. 243267, 2013.

Note: Authors in italics denote students under my supervision.